feat(lexer): Scan dot

tests/lexer/LexerScanTest.kt

@@ -1,16 +1,35 @@
 package be.ugent.logprog.lexer
 
+import lexer.Error
 import lexer.Lexer
 import lexer.TokenType
 import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
 import kotlin.test.assertEquals
 
 class LexerScanTest {
     @Test
     fun scan_emptyString_returnsEOF() {
-        val lexer = Lexer()
-        val tokens = lexer.scan("")
+        val lexer = Lexer("")
+        val tokens = lexer.scan()
         assertEquals(1, tokens.size)
         assertEquals(TokenType.EOF, tokens[0].type)
     }
+
+    @Test
+    fun scan_unknownSymbol_returnsError() {
+        val lexer = Lexer("€")
+        assertThrows<Error>({
+            val tokens = lexer.scan()
+        })
+    }
+
+    @Test
+    fun scan_dot_returnsDot() {
+        val lexer = Lexer(".")
+        val tokens = lexer.scan()
+        assertEquals(2, tokens.size)
+        assertEquals(TokenType.DOT, tokens[0].type, "Expected DOT token, got ${tokens[0].type}")
+        assertEquals(TokenType.EOF, tokens[1].type, "Expected EOF token, got ${tokens[1].type}")
+    }
 }